What oil do you use in your carb dashpots?

[mike@thenook]

I've always used engine oil as per the ws manual but just looking at the Faversham Classics website today in their user guide they suggest auto transmission fluid - anyone else tried this and if so, what was the result?
Never heard of this before but if it is good for Fav's then maybe it's worth a go...

Cheers

[Ian Durrant]

I use ATF and If i don't have any of that a low viscosity engine oil 0w30 or 0w40 whatever is available. I know lots of people use 20w50 but I think that's too thick, its much thicker than the su dashpot oil that was once available from all good motor factors.

I find thinner oil gives better throttle response but if you go too thin you will get lean stumble on snapping the throttle open. I seem to recall reading that ATF is 5w20 but I could be wrong.

[iani]

Penrite still make SU carb oil, that's what I use, thinner than engine oil.

Ian

[Staggard]

3 in 1 works for me.

[V Mad]

I dont have any

[len]

hi
Favesham Classics tuned my Stag a couple of years ago and put auto transmission fluid in the dash pots , I did question this and they said it was the best to use and my car runs great ! Definitely recommend it ,
Len

[singapore stag]

Lubrication is all thats needed IMO, so a thin oil should suffice. Its not as if there is stress and major friction that a thicker oil is called for.

Sukh.

[Tdm]

Well you learn something new on this Forum all the time. Have only ever used engine oil and never thought to use anything else, but next time I top the carbs up will have a go with ATF and see if there is any noticeable difference. If ATF gives a better response maybe I should add some to my Brandy glass!

[Jeff]

I've always used 3 in 1 or any clean engine oil.

I was advised to use ATF in my 5 speed manual gearbox by Richard Lane (Brighton Stag Specialist).

[wilf]

Lubrication is all thats needed IMO, so a thin oil should suffice. Its not as if there is stress and major friction that a thicker oil is called for.

Sukh.

Not really Sukh, the lubrication is a side effect. As I understand it the real purpose is damping the air valve opening, to avoid a lean flat spot if you snap the throttle open.

[staggering]

Guys - stupid question probably - but does this oil choice have the same effect on both SUs and Stromies or does the oil function differently for each carb type, thanks

Cheers
Ian

[singapore stag]

Not really Sukh, the lubrication is a side effect. As I understand it the real purpose is damping the air valve opening, to avoid a lean flat spot if you snap the throttle open.

Oh....shows how much I know, gulp.

Sukh.

[Mike Stevens]

The dashpot oil is used in both SUs and Strombergs to slow a rapid rise in the piston/diaphragm to allow a richer mixture while the engine is accelerating. This is actually what a dashpot is for!

I have to admit to always having used normal (20/50) engine oil. I shall certainly try ATF next time in the Stag and the SUs on my 2000!

Cheers,
Mike.

[staggering]

The dashpot oil is used in both SUs and Strombergs to slow a rapid rise in the piston/diaphragm to allow a richer mixture while the engine is accelerating. This is actually what a dashpot is for!

I have to admit to always having used normal (20/50) engine oil. I shall certainly try ATF next time in the Stag and the SUs on my 2000!

Cheers,
Mike.

Thanks Mike - like you I have only used 20/50 in mine - will try the ATF as well


Cheers
Ian

[mike@thenook]

Well you learn something new on this Forum all the time. Have only ever used engine oil and never thought to use anything else, but next time I top the carbs up will have a go with ATF and see if there is any noticeable difference. If ATF gives a better response maybe I should add some to my Brandy glass!

Sounds like a great plan to me, i'll give it a try and thanks to all for the other posts

Cheers!